/*
 * SSL/TLS interface functions for OpenSSL
 * Copyright (c) 2004-2010, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#ifndef CONFIG_SMARTCARD
#ifndef OPENSSL_NO_ENGINE
#define OPENSSL_NO_ENGINE
#endif
#endif

#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/pkcs12.h>
#include <openssl/x509v3.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif /* OPENSSL_NO_ENGINE */

#include "common.h"
#include "crypto.h"
#include "tls.h"

#if OPENSSL_VERSION_NUMBER >= 0x0090800fL
#define OPENSSL_d2i_TYPE const unsigned char **
#else
#define OPENSSL_d2i_TYPE unsigned char **
#endif

#ifdef SSL_F_SSL_SET_SESSION_TICKET_EXT
#ifdef SSL_OP_NO_TICKET
/*
 * Session ticket override patch was merged into OpenSSL 0.9.9 tree on
 * 2008-11-15. This version uses a bit different API compared to the old patch.
 */
#define CONFIG_OPENSSL_TICKET_OVERRIDE
#endif
#endif

static int tls_openssl_ref_count = 0;

struct tls_global {
    void (*event_cb)(void *ctx, enum tls_event ev,
            union tls_event_data *data);
    void *cb_ctx;
};

static struct tls_global *tls_global = NULL;


struct tls_connection {
    SSL *ssl;
    BIO *ssl_in, *ssl_out;
#ifndef OPENSSL_NO_ENGINE
    ENGINE *engine;        /* functional reference to the engine */
    EVP_PKEY *private_key; /* the private key if using engine */
#endif /* OPENSSL_NO_ENGINE */
    char *subject_match, *altsubject_match;
    int read_alerts, write_alerts, failed;

    tls_session_ticket_cb session_ticket_cb;
    void *session_ticket_cb_ctx;

    /* SessionTicket received from OpenSSL hello_extension_cb (server) */
    u8 *session_ticket;
    size_t session_ticket_len;

    unsigned int ca_cert_verify:1;
    unsigned int cert_probe:1;
    unsigned int server_cert_only:1;

    u8 srv_cert_hash[32];
};


#ifdef CONFIG_NO_STDOUT_DEBUG

static void _tls_show_errors(void)
{
    unsigned long err;

    while ((err = ERR_get_error())) {
        /* Just ignore the errors, since stdout is disabled */
    }
}
#define tls_show_errors(l, f, t) _tls_show_errors()

#else /* CONFIG_NO_STDOUT_DEBUG */

static void tls_show_errors(int level, const char *func, const char *txt)
{
    unsigned long err;

    wpa_printf(level, "OpenSSL: %s - %s %s",
            func, txt, ERR_error_string(ERR_get_error(), NULL));

    while ((err = ERR_get_error())) {
        wpa_printf(MSG_INFO, "OpenSSL: pending error: %s",
                ERR_error_string(err, NULL));
    }
}

#endif /* CONFIG_NO_STDOUT_DEBUG */


#ifdef CONFIG_NATIVE_WINDOWS

/* Windows CryptoAPI and access to certificate stores */
#include <wincrypt.h>

#ifdef __MINGW32_VERSION
/*
 * MinGW does not yet include all the needed definitions for CryptoAPI, so
 * define here whatever extra is needed.
 */
#define CERT_SYSTEM_STORE_CURRENT_USER (1 << 16)
#define CERT_STORE_READONLY_FLAG 0x00008000
#define CERT_STORE_OPEN_EXISTING_FLAG 0x00004000

#endif /* __MINGW32_VERSION */


struct cryptoapi_rsa_data {
    const CERT_CONTEXT *cert;
    HCRYPTPROV crypt_prov;
    DWORD key_spec;
    BOOL free_crypt_prov;
};


static void cryptoapi_error(const char *msg)
{
    wpa_printf(MSG_INFO, "CryptoAPI: %s; err=%u",
            msg, (unsigned int) GetLastError());
}


static int cryptoapi_rsa_pub_enc(int flen, const unsigned char *from,
        unsigned char *to, RSA *rsa, int padding)
{
    wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
    return 0;
}


static int cryptoapi_rsa_pub_dec(int flen, const unsigned char *from,
        unsigned char *to, RSA *rsa, int padding)
{
    wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
    return 0;
}


static int cryptoapi_rsa_priv_enc(int flen, const unsigned char *from,
        unsigned char *to, RSA *rsa, int padding)
{
    struct cryptoapi_rsa_data *priv =
        (struct cryptoapi_rsa_data *) rsa->meth->app_data;
    HCRYPTHASH hash;
    DWORD hash_size, len, i;
    unsigned char *buf = NULL;
    int ret = 0;

    if (priv == NULL) {
        RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
                ERR_R_PASSED_NULL_PARAMETER);
        return 0;
    }

    if (padding != RSA_PKCS1_PADDING) {
        RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
                RSA_R_UNKNOWN_PADDING_TYPE);
        return 0;
    }

    if (flen != 16 /* MD5 */ + 20 /* SHA-1 */) {
        wpa_printf(MSG_INFO, "%s - only MD5-SHA1 hash supported",
                __func__);
        RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
                RSA_R_INVALID_MESSAGE_LENGTH);
        return 0;
    }

    if (!CryptCreateHash(priv->crypt_prov, CALG_SSL3_SHAMD5, 0, 0, &hash))
    {
        cryptoapi_error("CryptCreateHash failed");
        return 0;
    }

    len = sizeof(hash_size);
    if (!CryptGetHashParam(hash, HP_HASHSIZE, (BYTE *) &hash_size, &len,
                0)) {
        cryptoapi_error("CryptGetHashParam failed");
        goto err;
    }

    if ((int) hash_size != flen) {
        wpa_printf(MSG_INFO, "CryptoAPI: Invalid hash size (%u != %d)",
                (unsigned) hash_size, flen);
        RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,
                RSA_R_INVALID_MESSAGE_LENGTH);
        goto err;
    }
    if (!CryptSetHashParam(hash, HP_HASHVAL, (BYTE * ) from, 0)) {
        cryptoapi_error("CryptSetHashParam failed");
        goto err;
    }

    len = RSA_size(rsa);
    buf = os_malloc(len);
    if (buf == NULL) {
        RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_MALLOC_FAILURE);
        goto err;
    }

    if (!CryptSignHash(hash, priv->key_spec, NULL, 0, buf, &len)) {
        cryptoapi_error("CryptSignHash failed");
        goto err;
    }

    for (i = 0; i < len; i++)
        to[i] = buf[len - i - 1];
    ret = len;

err:
    os_free(buf);
    CryptDestroyHash(hash);

    return ret;
}


static int cryptoapi_rsa_priv_dec(int flen, const unsigned char *from,
        unsigned char *to, RSA *rsa, int padding)
{
    wpa_printf(MSG_DEBUG, "%s - not implemented", __func__);
    return 0;
}


static void cryptoapi_free_data(struct cryptoapi_rsa_data *priv)
{
    if (priv == NULL)
        return;
    if (priv->crypt_prov && priv->free_crypt_prov)
        CryptReleaseContext(priv->crypt_prov, 0);
    if (priv->cert)
        CertFreeCertificateContext(priv->cert);
    os_free(priv);
}


static int cryptoapi_finish(RSA *rsa)
{
    cryptoapi_free_data((struct cryptoapi_rsa_data *) rsa->meth->app_data);
    os_free((void *) rsa->meth);
    rsa->meth = NULL;
    return 1;
}


static const CERT_CONTEXT * cryptoapi_find_cert(const char *name, DWORD store)
{
    HCERTSTORE cs;
    const CERT_CONTEXT *ret = NULL;

    cs = CertOpenStore((LPCSTR) CERT_STORE_PROV_SYSTEM, 0, 0,
            store | CERT_STORE_OPEN_EXISTING_FLAG |
            CERT_STORE_READONLY_FLAG, L"MY");
    if (cs == NULL) {
        cryptoapi_error("Failed to open 'My system store'");
        return NULL;
    }

    if (strncmp(name, "cert://", 7) == 0) {
        unsigned short wbuf[255];
        MultiByteToWideChar(CP_ACP, 0, name + 7, -1, wbuf, 255);
        ret = CertFindCertificateInStore(cs, X509_ASN_ENCODING |
                PKCS_7_ASN_ENCODING,
                0, CERT_FIND_SUBJECT_STR,
                wbuf, NULL);
    } else if (strncmp(name, "hash://", 7) == 0) {
        CRYPT_HASH_BLOB blob;
        int len;
        const char *hash = name + 7;
        unsigned char *buf;

        len = os_strlen(hash) / 2;
        buf = os_malloc(len);
        if (buf && hexstr2bin(hash, buf, len) == 0) {
            blob.cbData = len;
            blob.pbData = buf;
            ret = CertFindCertificateInStore(cs,
                    X509_ASN_ENCODING |
                    PKCS_7_ASN_ENCODING,
                    0, CERT_FIND_HASH,
                    &blob, NULL);
        }
        os_free(buf);
    }

    CertCloseStore(cs, 0);

    return ret;
}


static int tls_cryptoapi_cert(SSL *ssl, const char *name)
{
    X509 *cert = NULL;
    RSA *rsa = NULL, *pub_rsa;
    struct cryptoapi_rsa_data *priv;
    RSA_METHOD *rsa_meth;

    if (name == NULL ||
            (strncmp(name, "cert://", 7) != 0 &&
             strncmp(name, "hash://", 7) != 0))
        return -1;

    priv = os_zalloc(sizeof(*priv));
    rsa_meth = os_zalloc(sizeof(*rsa_meth));
    if (priv == NULL || rsa_meth == NULL) {
        wpa_printf(MSG_WARNING, "CryptoAPI: Failed to allocate memory "
                "for CryptoAPI RSA method");
        os_free(priv);
        os_free(rsa_meth);
        return -1;
    }

    priv->cert = cryptoapi_find_cert(name, CERT_SYSTEM_STORE_CURRENT_USER);
    if (priv->cert == NULL) {
        priv->cert = cryptoapi_find_cert(
                name, CERT_SYSTEM_STORE_LOCAL_MACHINE);
    }
    if (priv->cert == NULL) {
        wpa_printf(MSG_INFO, "CryptoAPI: Could not find certificate "
                "'%s'", name);
        goto err;
    }

    cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &priv->cert->pbCertEncoded,
            priv->cert->cbCertEncoded);
    if (cert == NULL) {
        wpa_printf(MSG_INFO, "CryptoAPI: Could not process X509 DER "
                "encoding");
        goto err;
    }

    if (!CryptAcquireCertificatePrivateKey(priv->cert,
                CRYPT_ACQUIRE_COMPARE_KEY_FLAG,
                NULL, &priv->crypt_prov,
                &priv->key_spec,
                &priv->free_crypt_prov)) {
        cryptoapi_error("Failed to acquire a private key for the "
                "certificate");
        goto err;
    }

    rsa_meth->name = "Microsoft CryptoAPI RSA Method";
    rsa_meth->rsa_pub_enc = cryptoapi_rsa_pub_enc;
    rsa_meth->rsa_pub_dec = cryptoapi_rsa_pub_dec;
    rsa_meth->rsa_priv_enc = cryptoapi_rsa_priv_enc;
    rsa_meth->rsa_priv_dec = cryptoapi_rsa_priv_dec;
    rsa_meth->finish = cryptoapi_finish;
    rsa_meth->flags = RSA_METHOD_FLAG_NO_CHECK;
    rsa_meth->app_data = (char *) priv;

    rsa = RSA_new();
    if (rsa == NULL) {
        SSLerr(SSL_F_SSL_CTX_USE_CERTIFICATE_FILE,
                ERR_R_MALLOC_FAILURE);
        goto err;
    }

    if (!SSL_use_certificate(ssl, cert)) {
        RSA_free(rsa);
        rsa = NULL;
        goto err;
    }
    pub_rsa = cert->cert_info->key->pkey->pkey.rsa;
    X509_free(cert);
    cert = NULL;

    rsa->n = BN_dup(pub_rsa->n);
    rsa->e = BN_dup(pub_rsa->e);
    if (!RSA_set_method(rsa, rsa_meth))
        goto err;

    if (!SSL_use_RSAPrivateKey(ssl, rsa))
        goto err;
    RSA_free(rsa);

    return 0;

err:
    if (cert)
        X509_free(cert);
    if (rsa)
        RSA_free(rsa);
    else {
        os_free(rsa_meth);
        cryptoapi_free_data(priv);
    }
    return -1;
}


static int tls_cryptoapi_ca_cert(SSL_CTX *ssl_ctx, SSL *ssl, const char *name)
{
    HCERTSTORE cs;
    PCCERT_CONTEXT ctx = NULL;
    X509 *cert;
    char buf[128];
    const char *store;
#ifdef UNICODE
    WCHAR *wstore;
#endif /* UNICODE */

    if (name == NULL || strncmp(name, "cert_store://", 13) != 0)
        return -1;

    store = name + 13;
#ifdef UNICODE
    wstore = os_malloc((os_strlen(store) + 1) * sizeof(WCHAR));
    if (wstore == NULL)
        return -1;
    wsprintf(wstore, L"%S", store);
    cs = CertOpenSystemStore(0, wstore);
    os_free(wstore);
#else /* UNICODE */
    cs = CertOpenSystemStore(0, store);
#endif /* UNICODE */
    if (cs == NULL) {
        wpa_printf(MSG_DEBUG, "%s: failed to open system cert store "
                "'%s': error=%d", __func__, store,
                (int) GetLastError());
        return -1;
    }

    while ((ctx = CertEnumCertificatesInStore(cs, ctx))) {
        cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ctx->pbCertEncoded,
                ctx->cbCertEncoded);
        if (cert == NULL) {
            wpa_printf(MSG_INFO, "CryptoAPI: Could not process "
                    "X509 DER encoding for CA cert");
            continue;
        }

        X509_NAME_oneline(X509_get_subject_name(cert), buf,
                sizeof(buf));
        wpa_printf(MSG_DEBUG, "OpenSSL: Loaded CA certificate for "
                "system certificate store: subject='%s'", buf);

        if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
            tls_show_errors(MSG_WARNING, __func__,
                    "Failed to add ca_cert to OpenSSL "
                    "certificate store");
        }

        X509_free(cert);
    }

    if (!CertCloseStore(cs, 0)) {
        wpa_printf(MSG_DEBUG, "%s: failed to close system cert store "
                "'%s': error=%d", __func__, name + 13,
                (int) GetLastError());
    }

    return 0;
}


#else /* CONFIG_NATIVE_WINDOWS */

static int tls_cryptoapi_cert(SSL *ssl, const char *name)
{
    return -1;
}

#endif /* CONFIG_NATIVE_WINDOWS */


static void ssl_info_cb(const SSL *ssl, int where, int ret)
{
    const char *str;
    int w;

    wpa_printf(MSG_DEBUG, "SSL: (where=0x%x ret=0x%x)", where, ret);
    w = where & ~SSL_ST_MASK;
    if (w & SSL_ST_CONNECT)
        str = "SSL_connect";
    else if (w & SSL_ST_ACCEPT)
        str = "SSL_accept";
    else
        str = "undefined";

    if (where & SSL_CB_LOOP) {
        wpa_printf(MSG_DEBUG, "SSL: %s:%s",
                str, SSL_state_string_long(ssl));
    } else if (where & SSL_CB_ALERT) {
        wpa_printf(MSG_INFO, "SSL: SSL3 alert: %s:%s:%s",
                where & SSL_CB_READ ?
                "read (remote end reported an error)" :
                "write (local SSL3 detected an error)",
                SSL_alert_type_string_long(ret),
                SSL_alert_desc_string_long(ret));
        if ((ret >> 8) == SSL3_AL_FATAL) {
            struct tls_connection *conn =
                SSL_get_app_data((SSL *) ssl);
            if (where & SSL_CB_READ)
                conn->read_alerts++;
            else
                conn->write_alerts++;
        }
    } else if (where & SSL_CB_EXIT && ret <= 0) {
        wpa_printf(MSG_DEBUG, "SSL: %s:%s in %s",
                str, ret == 0 ? "failed" : "error",
                SSL_state_string_long(ssl));
    }
}


#ifndef OPENSSL_NO_ENGINE
/**
 * tls_engine_load_dynamic_generic - load any openssl engine
 * @pre: an array of commands and values that load an engine initialized
 *       in the engine specific function
 * @post: an array of commands and values that initialize an already loaded
 *        engine (or %NULL if not required)
 * @id: the engine id of the engine to load (only required if post is not %NULL
 *
 * This function is a generic function that loads any openssl engine.
 *
 * Returns: 0 on success, -1 on failure
 */
static int tls_engine_load_dynamic_generic(const char *pre[],
        const char *post[], const char *id)
{
    ENGINE *engine;
    const char *dynamic_id = "dynamic";

    engine = ENGINE_by_id(id);
    if (engine) {
        ENGINE_free(engine);
        wpa_printf(MSG_DEBUG, "ENGINE: engine '%s' is already "
                "available", id);
        return 0;
    }
    ERR_clear_error();

    engine = ENGINE_by_id(dynamic_id);
    if (engine == NULL) {
        wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
                dynamic_id,
                ERR_error_string(ERR_get_error(), NULL));
        return -1;
    }

    /* Perform the pre commands. This will load the engine. */
    while (pre && pre[0]) {
        wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", pre[0], pre[1]);
        if (ENGINE_ctrl_cmd_string(engine, pre[0], pre[1], 0) == 0) {
            wpa_printf(MSG_INFO, "ENGINE: ctrl cmd_string failed: "
                    "%s %s [%s]", pre[0], pre[1],
                    ERR_error_string(ERR_get_error(), NULL));
            ENGINE_free(engine);
            return -1;
        }
        pre += 2;
    }

    /*
     * Free the reference to the "dynamic" engine. The loaded engine can
     * now be looked up using ENGINE_by_id().
     */
    ENGINE_free(engine);

    engine = ENGINE_by_id(id);
    if (engine == NULL) {
        wpa_printf(MSG_INFO, "ENGINE: Can't find engine %s [%s]",
                id, ERR_error_string(ERR_get_error(), NULL));
        return -1;
    }

    while (post && post[0]) {
        wpa_printf(MSG_DEBUG, "ENGINE: '%s' '%s'", post[0], post[1]);
        if (ENGINE_ctrl_cmd_string(engine, post[0], post[1], 0) == 0) {
            wpa_printf(MSG_DEBUG, "ENGINE: ctrl cmd_string failed:"
                    " %s %s [%s]", post[0], post[1],
                    ERR_error_string(ERR_get_error(), NULL));
            ENGINE_remove(engine);
            ENGINE_free(engine);
            return -1;
        }
        post += 2;
    }
    ENGINE_free(engine);

    return 0;
}


/**
 * tls_engine_load_dynamic_pkcs11 - load the pkcs11 engine provided by opensc
 * @pkcs11_so_path: pksc11_so_path from the configuration
 * @pcks11_module_path: pkcs11_module_path from the configuration
 */
static int tls_engine_load_dynamic_pkcs11(const char *pkcs11_so_path,
        const char *pkcs11_module_path)
{
    char *engine_id = "pkcs11";
    const char *pre_cmd[] = {
        "SO_PATH", NULL /* pkcs11_so_path */,
        "ID", NULL /* engine_id */,
        "LIST_ADD", "1",
        /* "NO_VCHECK", "1", */
        "LOAD", NULL,
        NULL, NULL
    };
    const char *post_cmd[] = {
        "MODULE_PATH", NULL /* pkcs11_module_path */,
        NULL, NULL
    };

    if (!pkcs11_so_path || !pkcs11_module_path)
        return 0;

    pre_cmd[1] = pkcs11_so_path;
    pre_cmd[3] = engine_id;
    post_cmd[1] = pkcs11_module_path;

    wpa_printf(MSG_DEBUG, "ENGINE: Loading pkcs11 Engine from %s",
            pkcs11_so_path);

    return tls_engine_load_dynamic_generic(pre_cmd, post_cmd, engine_id);
}


/**
 * tls_engine_load_dynamic_opensc - load the opensc engine provided by opensc
 * @opensc_so_path: opensc_so_path from the configuration
 */
static int tls_engine_load_dynamic_opensc(const char *opensc_so_path)
{
    char *engine_id = "opensc";
    const char *pre_cmd[] = {
        "SO_PATH", NULL /* opensc_so_path */,
        "ID", NULL /* engine_id */,
        "LIST_ADD", "1",
        "LOAD", NULL,
        NULL, NULL
    };

    if (!opensc_so_path)
        return 0;

    pre_cmd[1] = opensc_so_path;
    pre_cmd[3] = engine_id;

    wpa_printf(MSG_DEBUG, "ENGINE: Loading OpenSC Engine from %s",
            opensc_so_path);

    return tls_engine_load_dynamic_generic(pre_cmd, NULL, engine_id);
}
#endif /* OPENSSL_NO_ENGINE */


void * tls_init(const struct tls_config *conf)
{
    SSL_CTX *ssl;

    if (tls_openssl_ref_count == 0) {
        tls_global = os_zalloc(sizeof(*tls_global));
        if (tls_global == NULL)
            return NULL;
        if (conf) {
            tls_global->event_cb = conf->event_cb;
            tls_global->cb_ctx = conf->cb_ctx;
        }

#ifdef CONFIG_FIPS
#ifdef OPENSSL_FIPS
        if (conf && conf->fips_mode) {
            if (!FIPS_mode_set(1)) {
                wpa_printf(MSG_ERROR, "Failed to enable FIPS "
                        "mode");
                ERR_load_crypto_strings();
                ERR_print_errors_fp(stderr);
                return NULL;
            } else
                wpa_printf(MSG_INFO, "Running in FIPS mode");
        }
#else /* OPENSSL_FIPS */
        if (conf && conf->fips_mode) {
            wpa_printf(MSG_ERROR, "FIPS mode requested, but not "
                    "supported");
            return NULL;
        }
#endif /* OPENSSL_FIPS */
#endif /* CONFIG_FIPS */
        SSL_load_error_strings();
        SSL_library_init();
#ifndef OPENSSL_NO_SHA256
        EVP_add_digest(EVP_sha256());
#endif /* OPENSSL_NO_SHA256 */
        /* TODO: if /dev/urandom is available, PRNG is seeded
         * automatically. If this is not the case, random data should
         * be added here. */

#ifdef PKCS12_FUNCS
#ifndef OPENSSL_NO_RC2
        /*
         * 40-bit RC2 is commonly used in PKCS#12 files, so enable it.
         * This is enabled by PKCS12_PBE_add() in OpenSSL 0.9.8
         * versions, but it looks like OpenSSL 1.0.0 does not do that
         * anymore.
         */
        EVP_add_cipher(EVP_rc2_40_cbc());
#endif /* OPENSSL_NO_RC2 */
        PKCS12_PBE_add();
#endif  /* PKCS12_FUNCS */
    }
    tls_openssl_ref_count++;

    ssl = SSL_CTX_new(TLSv1_method());
    if (ssl == NULL)
        return NULL;

    SSL_CTX_set_info_callback(ssl, ssl_info_cb);

#ifndef OPENSSL_NO_ENGINE
    if (conf &&
            (conf->opensc_engine_path || conf->pkcs11_engine_path ||
             conf->pkcs11_module_path)) {
        wpa_printf(MSG_DEBUG, "ENGINE: Loading dynamic engine");
        ERR_load_ENGINE_strings();
        ENGINE_load_dynamic();

        if (tls_engine_load_dynamic_opensc(conf->opensc_engine_path) ||
                tls_engine_load_dynamic_pkcs11(conf->pkcs11_engine_path,
                    conf->pkcs11_module_path)) {
            tls_deinit(ssl);
            return NULL;
        }
    }
#endif /* OPENSSL_NO_ENGINE */

    return ssl;
}


void tls_deinit(void *ssl_ctx)
{
    SSL_CTX *ssl = ssl_ctx;
    SSL_CTX_free(ssl);

    tls_openssl_ref_count--;
    if (tls_openssl_ref_count == 0) {
#ifndef OPENSSL_NO_ENGINE
        ENGINE_cleanup();
#endif /* OPENSSL_NO_ENGINE */
        CRYPTO_cleanup_all_ex_data();
        ERR_remove_state(0);
        ERR_free_strings();
        EVP_cleanup();
        os_free(tls_global);
        tls_global = NULL;
    }
}


static int tls_engine_init(struct tls_connection *conn, const char *engine_id,
        const char *pin, const char *key_id,
        const char *cert_id, const char *ca_cert_id)
{
#ifndef OPENSSL_NO_ENGINE
    int ret = -1;
    if (engine_id == NULL) {
        wpa_printf(MSG_ERROR, "ENGINE: Engine ID not set");
        return -1;
    }
    if (pin == NULL) {
        wpa_printf(MSG_ERROR, "ENGINE: Smartcard PIN not set");
        return -1;
    }
    if (key_id == NULL) {
        wpa_printf(MSG_ERROR, "ENGINE: Key Id not set");
        return -1;
    }

    ERR_clear_error();
    conn->engine = ENGINE_by_id(engine_id);
    if (!conn->engine) {
        wpa_printf(MSG_ERROR, "ENGINE: engine %s not available [%s]",
                engine_id, ERR_error_string(ERR_get_error(), NULL));
        goto err;
    }
    if (ENGINE_init(conn->engine) != 1) {
        wpa_printf(MSG_ERROR, "ENGINE: engine init failed "
                "(engine: %s) [%s]", engine_id,
                ERR_error_string(ERR_get_error(), NULL));
        goto err;
    }
    wpa_printf(MSG_DEBUG, "ENGINE: engine initialized");

    if (ENGINE_ctrl_cmd_string(conn->engine, "PIN", pin, 0) == 0) {
        wpa_printf(MSG_ERROR, "ENGINE: cannot set pin [%s]",
                ERR_error_string(ERR_get_error(), NULL));
        goto err;
    }
    /* load private key first in-case PIN is required for cert */
    conn->private_key = ENGINE_load_private_key(conn->engine,
            key_id, NULL, NULL);
    if (!conn->private_key) {
        wpa_printf(MSG_ERROR, "ENGINE: cannot load private key with id"
                " '%s' [%s]", key_id,
                ERR_error_string(ERR_get_error(), NULL));
        ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
        goto err;
    }

    /* handle a certificate and/or CA certificate */
    if (cert_id || ca_cert_id) {
        const char *cmd_name = "LOAD_CERT_CTRL";

        /* test if the engine supports a LOAD_CERT_CTRL */
        if (!ENGINE_ctrl(conn->engine, ENGINE_CTRL_GET_CMD_FROM_NAME,
                    0, (void *)cmd_name, NULL)) {
            wpa_printf(MSG_ERROR, "ENGINE: engine does not support"
                    " loading certificates");
            ret = TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
            goto err;
        }
    }

    return 0;

err:
    if (conn->engine) {
        ENGINE_free(conn->engine);
        conn->engine = NULL;
    }

    if (conn->private_key) {
        EVP_PKEY_free(conn->private_key);
        conn->private_key = NULL;
    }

    return ret;
#else /* OPENSSL_NO_ENGINE */
    return 0;
#endif /* OPENSSL_NO_ENGINE */
}


static void tls_engine_deinit(struct tls_connection *conn)
{
#ifndef OPENSSL_NO_ENGINE
    wpa_printf(MSG_DEBUG, "ENGINE: engine deinit");
    if (conn->private_key) {
        EVP_PKEY_free(conn->private_key);
        conn->private_key = NULL;
    }
    if (conn->engine) {
        ENGINE_finish(conn->engine);
        conn->engine = NULL;
    }
#endif /* OPENSSL_NO_ENGINE */
}


int tls_get_errors(void *ssl_ctx)
{
    int count = 0;
    unsigned long err;

    while ((err = ERR_get_error())) {
        wpa_printf(MSG_INFO, "TLS - SSL error: %s",
                ERR_error_string(err, NULL));
        count++;
    }

    return count;
}

struct tls_connection * tls_connection_init(void *ssl_ctx)
{
    SSL_CTX *ssl = ssl_ctx;
    struct tls_connection *conn;
    long options;

    conn = os_zalloc(sizeof(*conn));
    if (conn == NULL)
        return NULL;
    conn->ssl = SSL_new(ssl);
    if (conn->ssl == NULL) {
        tls_show_errors(MSG_INFO, __func__,
                "Failed to initialize new SSL connection");
        os_free(conn);
        return NULL;
    }

    SSL_set_app_data(conn->ssl, conn);
    options = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
        SSL_OP_SINGLE_DH_USE;
#ifdef SSL_OP_NO_COMPRESSION
    options |= SSL_OP_NO_COMPRESSION;
#endif /* SSL_OP_NO_COMPRESSION */
    SSL_set_options(conn->ssl, options);

    conn->ssl_in = BIO_new(BIO_s_mem());
    if (!conn->ssl_in) {
        tls_show_errors(MSG_INFO, __func__,
                "Failed to create a new BIO for ssl_in");
        SSL_free(conn->ssl);
        os_free(conn);
        return NULL;
    }

    conn->ssl_out = BIO_new(BIO_s_mem());
    if (!conn->ssl_out) {
        tls_show_errors(MSG_INFO, __func__,
                "Failed to create a new BIO for ssl_out");
        SSL_free(conn->ssl);
        BIO_free(conn->ssl_in);
        os_free(conn);
        return NULL;
    }

    SSL_set_bio(conn->ssl, conn->ssl_in, conn->ssl_out);

    return conn;
}


void tls_connection_deinit(void *ssl_ctx, struct tls_connection *conn)
{
    if (conn == NULL)
        return;
    SSL_free(conn->ssl);
    tls_engine_deinit(conn);
    os_free(conn->subject_match);
    os_free(conn->altsubject_match);
    os_free(conn->session_ticket);
    os_free(conn);
}


int tls_connection_established(void *ssl_ctx, struct tls_connection *conn)
{
    return conn ? SSL_is_init_finished(conn->ssl) : 0;
}


int tls_connection_shutdown(void *ssl_ctx, struct tls_connection *conn)
{
    if (conn == NULL)
        return -1;

    /* Shutdown previous TLS connection without notifying the peer
     * because the connection was already terminated in practice
     * and "close notify" shutdown alert would confuse AS. */
    SSL_set_quiet_shutdown(conn->ssl, 1);
    SSL_shutdown(conn->ssl);
    return 0;
}


static int tls_match_altsubject_component(X509 *cert, int type,
        const char *value, size_t len)
{
    GENERAL_NAME *gen;
    void *ext;
    int i, found = 0;

    ext = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL);

    for (i = 0; ext && i < sk_GENERAL_NAME_num(ext); i++) {
        gen = sk_GENERAL_NAME_value(ext, i);
        if (gen->type != type)
            continue;
        if (os_strlen((char *) gen->d.ia5->data) == len &&
                os_memcmp(value, gen->d.ia5->data, len) == 0)
            found++;
    }

    return found;
}


static int tls_match_altsubject(X509 *cert, const char *match)
{
    int type;
    const char *pos, *end;
    size_t len;

    pos = match;
    do {
        if (os_strncmp(pos, "EMAIL:", 6) == 0) {
            type = GEN_EMAIL;
            pos += 6;
        } else if (os_strncmp(pos, "DNS:", 4) == 0) {
            type = GEN_DNS;
            pos += 4;
        } else if (os_strncmp(pos, "URI:", 4) == 0) {
            type = GEN_URI;
            pos += 4;
        } else {
            wpa_printf(MSG_INFO, "TLS: Invalid altSubjectName "
                    "match '%s'", pos);
            return 0;
        }
        end = os_strchr(pos, ';');
        while (end) {
            if (os_strncmp(end + 1, "EMAIL:", 6) == 0 ||
                    os_strncmp(end + 1, "DNS:", 4) == 0 ||
                    os_strncmp(end + 1, "URI:", 4) == 0)
                break;
            end = os_strchr(end + 1, ';');
        }
        if (end)
            len = end - pos;
        else
            len = os_strlen(pos);
        if (tls_match_altsubject_component(cert, type, pos, len) > 0)
            return 1;
        pos = end + 1;
    } while (end);

    return 0;
}


static enum tls_fail_reason openssl_tls_fail_reason(int err)
{
    switch (err) {
        case X509_V_ERR_CERT_REVOKED:
            return TLS_FAIL_REVOKED;
        case X509_V_ERR_CERT_NOT_YET_VALID:
        case X509_V_ERR_CRL_NOT_YET_VALID:
            return TLS_FAIL_NOT_YET_VALID;
        case X509_V_ERR_CERT_HAS_EXPIRED:
        case X509_V_ERR_CRL_HAS_EXPIRED:
            return TLS_FAIL_EXPIRED;
        case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
        case X509_V_ERR_UNABLE_TO_GET_CRL:
        case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
        case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
        case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
        case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
        case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
        case X509_V_ERR_CERT_CHAIN_TOO_LONG:
        case X509_V_ERR_PATH_LENGTH_EXCEEDED:
        case X509_V_ERR_INVALID_CA:
            return TLS_FAIL_UNTRUSTED;
        case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
        case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
        case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
        case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
        case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
        case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
        case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
        case X509_V_ERR_CERT_UNTRUSTED:
        case X509_V_ERR_CERT_REJECTED:
            return TLS_FAIL_BAD_CERTIFICATE;
        default:
            return TLS_FAIL_UNSPECIFIED;
    }
}


static struct wpabuf * get_x509_cert(X509 *cert)
{
    struct wpabuf *buf;
    u8 *tmp;

    int cert_len = i2d_X509(cert, NULL);
    if (cert_len <= 0)
        return NULL;

    buf = wpabuf_alloc(cert_len);
    if (buf == NULL)
        return NULL;

    tmp = wpabuf_put(buf, cert_len);
    i2d_X509(cert, &tmp);
    return buf;
}


static void openssl_tls_fail_event(struct tls_connection *conn,
        X509 *err_cert, int err, int depth,
        const char *subject, const char *err_str,
        enum tls_fail_reason reason)
{
    union tls_event_data ev;
    struct wpabuf *cert = NULL;

    if (tls_global->event_cb == NULL)
        return;

    cert = get_x509_cert(err_cert);
    os_memset(&ev, 0, sizeof(ev));
    ev.cert_fail.reason = reason != TLS_FAIL_UNSPECIFIED ?
        reason : openssl_tls_fail_reason(err);
    ev.cert_fail.depth = depth;
    ev.cert_fail.subject = subject;
    ev.cert_fail.reason_txt = err_str;
    ev.cert_fail.cert = cert;
    tls_global->event_cb(tls_global->cb_ctx, TLS_CERT_CHAIN_FAILURE, &ev);
    wpabuf_free(cert);
}


static void openssl_tls_cert_event(struct tls_connection *conn,
        X509 *err_cert, int depth,
        const char *subject)
{
    struct wpabuf *cert = NULL;
    union tls_event_data ev;
#ifdef CONFIG_SHA256
    u8 hash[32];
#endif /* CONFIG_SHA256 */

    if (tls_global->event_cb == NULL)
        return;

    os_memset(&ev, 0, sizeof(ev));
    if (conn->cert_probe) {
        cert = get_x509_cert(err_cert);
        ev.peer_cert.cert = cert;
    }
#ifdef CONFIG_SHA256
    if (cert) {
        const u8 *addr[1];
        size_t len[1];
        addr[0] = wpabuf_head(cert);
        len[0] = wpabuf_len(cert);
        if (sha256_vector(1, addr, len, hash) == 0) {
            ev.peer_cert.hash = hash;
            ev.peer_cert.hash_len = sizeof(hash);
        }
    }
#endif /* CONFIG_SHA256 */
    ev.peer_cert.depth = depth;
    ev.peer_cert.subject = subject;
    tls_global->event_cb(tls_global->cb_ctx, TLS_PEER_CERTIFICATE, &ev);
    wpabuf_free(cert);
}


static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
{
    char buf[256];
    X509 *err_cert;
    int err, depth;
    SSL *ssl;
    struct tls_connection *conn;
    char *match, *altmatch;
    const char *err_str;

    err_cert = X509_STORE_CTX_get_current_cert(x509_ctx);
    err = X509_STORE_CTX_get_error(x509_ctx);
    depth = X509_STORE_CTX_get_error_depth(x509_ctx);
    ssl = X509_STORE_CTX_get_ex_data(x509_ctx,
            SSL_get_ex_data_X509_STORE_CTX_idx());
    X509_NAME_oneline(X509_get_subject_name(err_cert), buf, sizeof(buf));

    conn = SSL_get_app_data(ssl);
    match = conn ? conn->subject_match : NULL;
    altmatch = conn ? conn->altsubject_match : NULL;

    if (!preverify_ok && !conn->ca_cert_verify)
        preverify_ok = 1;
    if (!preverify_ok && depth > 0 && conn->server_cert_only)
        preverify_ok = 1;

    err_str = X509_verify_cert_error_string(err);

#ifdef CONFIG_SHA256
    if (preverify_ok && depth == 0 && conn->server_cert_only) {
        struct wpabuf *cert;
        cert = get_x509_cert(err_cert);
        if (!cert) {
            wpa_printf(MSG_DEBUG, "OpenSSL: Could not fetch "
                    "server certificate data");
            preverify_ok = 0;
        } else {
            u8 hash[32];
            const u8 *addr[1];
            size_t len[1];
            addr[0] = wpabuf_head(cert);
            len[0] = wpabuf_len(cert);
            if (sha256_vector(1, addr, len, hash) < 0 ||
                    os_memcmp(conn->srv_cert_hash, hash, 32) != 0) {
                err_str = "Server certificate mismatch";
                err = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
                preverify_ok = 0;
            }
            wpabuf_free(cert);
        }
    }
#endif /* CONFIG_SHA256 */

    if (!preverify_ok) {
        wpa_printf(MSG_WARNING, "TLS: Certificate verification failed,"
                " error %d (%s) depth %d for '%s'", err, err_str,
                depth, buf);
        openssl_tls_fail_event(conn, err_cert, err, depth, buf,
                err_str, TLS_FAIL_UNSPECIFIED);
        return preverify_ok;
    }

    wpa_printf(MSG_DEBUG, "TLS: tls_verify_cb - preverify_ok=%d "
            "err=%d (%s) ca_cert_verify=%d depth=%d buf='%s'",
            preverify_ok, err, err_str,
            conn->ca_cert_verify, depth, buf);
    if (depth == 0 && match && os_strstr(buf, match) == NULL) {
        wpa_printf(MSG_WARNING, "TLS: Subject '%s' did not "
                "match with '%s'", buf, match);
        preverify_ok = 0;
        openssl_tls_fail_event(conn, err_cert, err, depth, buf,
                "Subject mismatch",
                TLS_FAIL_SUBJECT_MISMATCH);
    } else if (depth == 0 && altmatch &&
            !tls_match_altsubject(err_cert, altmatch)) {
        wpa_printf(MSG_WARNING, "TLS: altSubjectName match "
                "'%s' not found", altmatch);
        preverify_ok = 0;
        openssl_tls_fail_event(conn, err_cert, err, depth, buf,
                "AltSubject mismatch",
                TLS_FAIL_ALTSUBJECT_MISMATCH);
    } else
        openssl_tls_cert_event(conn, err_cert, depth, buf);

    if (conn->cert_probe && preverify_ok && depth == 0) {
        wpa_printf(MSG_DEBUG, "OpenSSL: Reject server certificate "
                "on probe-only run");
        preverify_ok = 0;
        openssl_tls_fail_event(conn, err_cert, err, depth, buf,
                "Server certificate chain probe",
                TLS_FAIL_SERVER_CHAIN_PROBE);
    }

    return preverify_ok;
}


#ifndef OPENSSL_NO_STDIO
static int tls_load_ca_der(void *_ssl_ctx, const char *ca_cert)
{
    SSL_CTX *ssl_ctx = _ssl_ctx;
    X509_LOOKUP *lookup;
    int ret = 0;

    lookup = X509_STORE_add_lookup(ssl_ctx->cert_store,
            X509_LOOKUP_file());
    if (lookup == NULL) {
        tls_show_errors(MSG_WARNING, __func__,
                "Failed add lookup for X509 store");
        return -1;
    }

    if (!X509_LOOKUP_load_file(lookup, ca_cert, X509_FILETYPE_ASN1)) {
        unsigned long err = ERR_peek_error();
        tls_show_errors(MSG_WARNING, __func__,
                "Failed load CA in DER format");
        if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
                ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
            wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
                    "cert already in hash table error",
                    __func__);
        } else
            ret = -1;
    }

    return ret;
}
#endif /* OPENSSL_NO_STDIO */


static int tls_connection_ca_cert(void *_ssl_ctx, struct tls_connection *conn,
        const char *ca_cert, const u8 *ca_cert_blob,
        size_t ca_cert_blob_len, const char *ca_path)
{
    SSL_CTX *ssl_ctx = _ssl_ctx;

    /*
     * Remove previously configured trusted CA certificates before adding
     * new ones.
     */
    X509_STORE_free(ssl_ctx->cert_store);
    ssl_ctx->cert_store = X509_STORE_new();
    if (ssl_ctx->cert_store == NULL) {
        wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
                "certificate store", __func__);
        return -1;
    }

    SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
    conn->ca_cert_verify = 1;

    if (ca_cert && os_strncmp(ca_cert, "probe://", 8) == 0) {
        wpa_printf(MSG_DEBUG, "OpenSSL: Probe for server certificate "
                "chain");
        conn->cert_probe = 1;
        conn->ca_cert_verify = 0;
        return 0;
    }

    if (ca_cert && os_strncmp(ca_cert, "hash://", 7) == 0) {
#ifdef CONFIG_SHA256
        const char *pos = ca_cert + 7;
        if (os_strncmp(pos, "server/sha256/", 14) != 0) {
            wpa_printf(MSG_DEBUG, "OpenSSL: Unsupported ca_cert "
                    "hash value '%s'", ca_cert);
            return -1;
        }
        pos += 14;
        if (os_strlen(pos) != 32 * 2) {
            wpa_printf(MSG_DEBUG, "OpenSSL: Unexpected SHA256 "
                    "hash length in ca_cert '%s'", ca_cert);
            return -1;
        }
        if (hexstr2bin(pos, conn->srv_cert_hash, 32) < 0) {
            wpa_printf(MSG_DEBUG, "OpenSSL: Invalid SHA256 hash "
                    "value in ca_cert '%s'", ca_cert);
            return -1;
        }
        conn->server_cert_only = 1;
        wpa_printf(MSG_DEBUG, "OpenSSL: Checking only server "
                "certificate match");
        return 0;
#else /* CONFIG_SHA256 */
        wpa_printf(MSG_INFO, "No SHA256 included in the build - "
                "cannot validate server certificate hash");
        return -1;
#endif /* CONFIG_SHA256 */
    }

    if (ca_cert_blob) {
        X509 *cert = d2i_X509(NULL, (OPENSSL_d2i_TYPE) &ca_cert_blob,
                ca_cert_blob_len);
        if (cert == NULL) {
            tls_show_errors(MSG_WARNING, __func__,
                    "Failed to parse ca_cert_blob");
            return -1;
        }

        if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
            unsigned long err = ERR_peek_error();
            tls_show_errors(MSG_WARNING, __func__,
                    "Failed to add ca_cert_blob to "
                    "certificate store");
            if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
                    ERR_GET_REASON(err) ==
                    X509_R_CERT_ALREADY_IN_HASH_TABLE) {
                wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring "
                        "cert already in hash table error",
                        __func__);
            } else {
                X509_free(cert);
                return -1;
            }
        }
        X509_free(cert);
        wpa_printf(MSG_DEBUG, "OpenSSL: %s - added ca_cert_blob "
                "to certificate store", __func__);
        return 0;
    }

#ifdef CONFIG_NATIVE_WINDOWS
    if (ca_cert && tls_cryptoapi_ca_cert(ssl_ctx, conn->ssl, ca_cert) ==
            0) {
        wpa_printf(MSG_DEBUG, "OpenSSL: Added CA certificates from "
                "system certificate store");
        return 0;
    }
#endif /* CONFIG_NATIVE_WINDOWS */

    if (ca_cert || ca_path) {
#ifndef OPENSSL_NO_STDIO
        if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, ca_path) !=
                1) {
            tls_show_errors(MSG_WARNING, __func__,
                    "Failed to load root certificates");
            if (ca_cert &&
                    tls_load_ca_der(ssl_ctx, ca_cert) == 0) {
                wpa_printf(MSG_DEBUG, "OpenSSL: %s - loaded "
                        "DER format CA certificate",
                        __func__);
            } else
                return -1;
        } else {
            wpa_printf(MSG_DEBUG, "TLS: Trusted root "
                    "certificate(s) loaded");
            tls_get_errors(ssl_ctx);
        }
#else /* OPENSSL_NO_STDIO */
        wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
                __func__);
        return -1;
#endif /* OPENSSL_NO_STDIO */
    } else {
        /* No ca_cert configured - do not try to verify server
         * certificate */
        conn->ca_cert_verify = 0;
    }

    return 0;
}


static int tls_global_ca_cert(SSL_CTX *ssl_ctx, const char *ca_cert)
{
    if (ca_cert) {
        if (SSL_CTX_load_verify_locations(ssl_ctx, ca_cert, NULL) != 1)
        {
            tls_show_errors(MSG_WARNING, __func__,
                    "Failed to load root certificates");
            return -1;
        }

        wpa_printf(MSG_DEBUG, "TLS: Trusted root "
                "certificate(s) loaded");

#ifndef OPENSSL_NO_STDIO
        /* Add the same CAs to the client certificate requests */
        SSL_CTX_set_client_CA_list(ssl_ctx,
                SSL_load_client_CA_file(ca_cert));
#endif /* OPENSSL_NO_STDIO */
    }

    return 0;
}


int tls_global_set_verify(void *ssl_ctx, int check_crl)
{
    int flags;

    if (check_crl) {
        X509_STORE *cs = SSL_CTX_get_cert_store(ssl_ctx);
        if (cs == NULL) {
            tls_show_errors(MSG_INFO, __func__, "Failed to get "
                    "certificate store when enabling "
                    "check_crl");
            return -1;
        }
        flags = X509_V_FLAG_CRL_CHECK;
        if (check_crl == 2)
            flags |= X509_V_FLAG_CRL_CHECK_ALL;
        X509_STORE_set_flags(cs, flags);
    }
    return 0;
}


static int tls_connection_set_subject_match(struct tls_connection *conn,
        const char *subject_match,
        const char *altsubject_match)
{
    os_free(conn->subject_match);
    conn->subject_match = NULL;
    if (subject_match) {
        conn->subject_match = os_strdup(subject_match);
        if (conn->subject_match == NULL)
            return -1;
    }

    os_free(conn->altsubject_match);
    conn->altsubject_match = NULL;
    if (altsubject_match) {
        conn->altsubject_match = os_strdup(altsubject_match);
        if (conn->altsubject_match == NULL)
            return -1;
    }

    return 0;
}


int tls_connection_set_verify(void *ssl_ctx, struct tls_connection *conn,
        int verify_peer)
{
    static int counter = 0;

    if (conn == NULL)
        return -1;

    if (verify_peer) {
        conn->ca_cert_verify = 1;
        SSL_set_verify(conn->ssl, SSL_VERIFY_PEER |
                SSL_VERIFY_FAIL_IF_NO_PEER_CERT |
                SSL_VERIFY_CLIENT_ONCE, tls_verify_cb);
    } else {
        conn->ca_cert_verify = 0;
        SSL_set_verify(conn->ssl, SSL_VERIFY_NONE, NULL);
    }

    SSL_set_accept_state(conn->ssl);

    /*
     * Set session id context in order to avoid fatal errors when client
     * tries to resume a session. However, set the context to a unique
     * value in order to effectively disable session resumption for now
     * since not all areas of the server code are ready for it (e.g.,
     * EAP-TTLS needs special handling for Phase 2 after abbreviated TLS
     * handshake).
     */
    counter++;
    SSL_set_session_id_context(conn->ssl,
            (const unsigned char *) &counter,
            sizeof(counter));

    return 0;
}


static int tls_connection_client_cert(struct tls_connection *conn,
        const char *client_cert,
        const u8 *client_cert_blob,
        size_t client_cert_blob_len)
{
    if (client_cert == NULL && client_cert_blob == NULL)
        return 0;

    if (client_cert_blob &&
            SSL_use_certificate_ASN1(conn->ssl, (u8 *) client_cert_blob,
                client_cert_blob_len) == 1) {
        wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_ASN1 --> "
                "OK");
        return 0;
    } else if (client_cert_blob) {
        tls_show_errors(MSG_DEBUG, __func__,
                "SSL_use_certificate_ASN1 failed");
    }

    if (client_cert == NULL)
        return -1;

#ifndef OPENSSL_NO_STDIO
    if (SSL_use_certificate_file(conn->ssl, client_cert,
                SSL_FILETYPE_ASN1) == 1) {
        wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (DER)"
                " --> OK");
        return 0;
    } else {
        tls_show_errors(MSG_DEBUG, __func__,
                "SSL_use_certificate_file (DER) failed");
    }

    if (SSL_use_certificate_file(conn->ssl, client_cert,
                SSL_FILETYPE_PEM) == 1) {
        wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_certificate_file (PEM)"
                " --> OK");
        return 0;
    } else {
        tls_show_errors(MSG_DEBUG, __func__,
                "SSL_use_certificate_file (PEM) failed");
    }
#else /* OPENSSL_NO_STDIO */
    wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
#endif /* OPENSSL_NO_STDIO */

    return -1;
}


static int tls_global_client_cert(SSL_CTX *ssl_ctx, const char *client_cert)
{
#ifndef OPENSSL_NO_STDIO
    if (client_cert == NULL)
        return 0;

    if (SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
                SSL_FILETYPE_ASN1) != 1 &&
            SSL_CTX_use_certificate_file(ssl_ctx, client_cert,
                SSL_FILETYPE_PEM) != 1) {
        tls_show_errors(MSG_INFO, __func__,
                "Failed to load client certificate");
        return -1;
    }
    return 0;
#else /* OPENSSL_NO_STDIO */
    if (client_cert == NULL)
        return 0;
    wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO", __func__);
    return -1;
#endif /* OPENSSL_NO_STDIO */
}


static int tls_passwd_cb(char *buf, int size, int rwflag, void *password)
{
    if (password == NULL) {
        return 0;
    }
    os_strlcpy(buf, (char *) password, size);
    return os_strlen(buf);
}


#ifdef PKCS12_FUNCS
static int tls_parse_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, PKCS12 *p12,
        const char *passwd)
{
    EVP_PKEY *pkey;
    X509 *cert;
    STACK_OF(X509) *certs;
    int res = 0;
    char buf[256];

    pkey = NULL;
    cert = NULL;
    certs = NULL;
    if (!PKCS12_parse(p12, passwd, &pkey, &cert, &certs)) {
        tls_show_errors(MSG_DEBUG, __func__,
                "Failed to parse PKCS12 file");
        PKCS12_free(p12);
        return -1;
    }
    wpa_printf(MSG_DEBUG, "TLS: Successfully parsed PKCS12 data");

    if (cert) {
        X509_NAME_oneline(X509_get_subject_name(cert), buf,
                sizeof(buf));
        wpa_printf(MSG_DEBUG, "TLS: Got certificate from PKCS12: "
                "subject='%s'", buf);
        if (ssl) {
            if (SSL_use_certificate(ssl, cert) != 1)
                res = -1;
        } else {
            if (SSL_CTX_use_certificate(ssl_ctx, cert) != 1)
                res = -1;
        }
        X509_free(cert);
    }

    if (pkey) {
        wpa_printf(MSG_DEBUG, "TLS: Got private key from PKCS12");
        if (ssl) {
            if (SSL_use_PrivateKey(ssl, pkey) != 1)
                res = -1;
        } else {
            if (SSL_CTX_use_PrivateKey(ssl_ctx, pkey) != 1)
                res = -1;
        }
        EVP_PKEY_free(pkey);
    }

    if (certs) {
        while ((cert = sk_X509_pop(certs)) != NULL) {
            X509_NAME_oneline(X509_get_subject_name(cert), buf,
                    sizeof(buf));
            wpa_printf(MSG_DEBUG, "TLS: additional certificate"
                    " from PKCS12: subject='%s'", buf);
            /*
             * There is no SSL equivalent for the chain cert - so
             * always add it to the context...
             */
            if (SSL_CTX_add_extra_chain_cert(ssl_ctx, cert) != 1) {
                res = -1;
                break;
            }
        }
        sk_X509_free(certs);
    }

    PKCS12_free(p12);

    if (res < 0)
        tls_get_errors(ssl_ctx);

    return res;
}
#endif  /* PKCS12_FUNCS */


static int tls_read_pkcs12(SSL_CTX *ssl_ctx, SSL *ssl, const char *private_key,
        const char *passwd)
{
#ifdef PKCS12_FUNCS
    FILE *f;
    PKCS12 *p12;

    f = fopen(private_key, "rb");
    if (f == NULL)
        return -1;

    p12 = d2i_PKCS12_fp(f, NULL);
    fclose(f);

    if (p12 == NULL) {
        tls_show_errors(MSG_INFO, __func__,
                "Failed to use PKCS#12 file");
        return -1;
    }

    return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);

#else /* PKCS12_FUNCS */
    wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot read "
            "p12/pfx files");
    return -1;
#endif  /* PKCS12_FUNCS */
}


static int tls_read_pkcs12_blob(SSL_CTX *ssl_ctx, SSL *ssl,
        const u8 *blob, size_t len, const char *passwd)
{
#ifdef PKCS12_FUNCS
    PKCS12 *p12;

    p12 = d2i_PKCS12(NULL, (OPENSSL_d2i_TYPE) &blob, len);
    if (p12 == NULL) {
        tls_show_errors(MSG_INFO, __func__,
                "Failed to use PKCS#12 blob");
        return -1;
    }

    return tls_parse_pkcs12(ssl_ctx, ssl, p12, passwd);

#else /* PKCS12_FUNCS */
    wpa_printf(MSG_INFO, "TLS: PKCS12 support disabled - cannot parse "
            "p12/pfx blobs");
    return -1;
#endif  /* PKCS12_FUNCS */
}


#ifndef OPENSSL_NO_ENGINE
static int tls_engine_get_cert(struct tls_connection *conn,
        const char *cert_id,
        X509 **cert)
{
    /* this runs after the private key is loaded so no PIN is required */
    struct {
        const char *cert_id;
        X509 *cert;
    } params;
    params.cert_id = cert_id;
    params.cert = NULL;

    if (!ENGINE_ctrl_cmd(conn->engine, "LOAD_CERT_CTRL",
                0, &params, NULL, 1)) {
        wpa_printf(MSG_ERROR, "ENGINE: cannot load client cert with id"
                " '%s' [%s]", cert_id,
                ERR_error_string(ERR_get_error(), NULL));
        return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
    }
    if (!params.cert) {
        wpa_printf(MSG_ERROR, "ENGINE: did not properly cert with id"
                " '%s'", cert_id);
        return TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED;
    }
    *cert = params.cert;
    return 0;
}
#endif /* OPENSSL_NO_ENGINE */


static int tls_connection_engine_client_cert(struct tls_connection *conn,
        const char *cert_id)
{
#ifndef OPENSSL_NO_ENGINE
    X509 *cert;

    if (tls_engine_get_cert(conn, cert_id, &cert))
        return -1;

    if (!SSL_use_certificate(conn->ssl, cert)) {
        tls_show_errors(MSG_ERROR, __func__,
                "SSL_use_certificate failed");
        X509_free(cert);
        return -1;
    }
    X509_free(cert);
    wpa_printf(MSG_DEBUG, "ENGINE: SSL_use_certificate --> "
            "OK");
    return 0;

#else /* OPENSSL_NO_ENGINE */
    return -1;
#endif /* OPENSSL_NO_ENGINE */
}


static int tls_connection_engine_ca_cert(void *_ssl_ctx,
        struct tls_connection *conn,
        const char *ca_cert_id)
{
#ifndef OPENSSL_NO_ENGINE
    X509 *cert;
    SSL_CTX *ssl_ctx = _ssl_ctx;

    if (tls_engine_get_cert(conn, ca_cert_id, &cert))
        return -1;

    /* start off the same as tls_connection_ca_cert */
    X509_STORE_free(ssl_ctx->cert_store);
    ssl_ctx->cert_store = X509_STORE_new();
    if (ssl_ctx->cert_store == NULL) {
        wpa_printf(MSG_DEBUG, "OpenSSL: %s - failed to allocate new "
                "certificate store", __func__);
        X509_free(cert);
        return -1;
    }
    if (!X509_STORE_add_cert(ssl_ctx->cert_store, cert)) {
        unsigned long err = ERR_peek_error();
        tls_show_errors(MSG_WARNING, __func__,
                "Failed to add CA certificate from engine "
                "to certificate store");
        if (ERR_GET_LIB(err) == ERR_LIB_X509 &&
                ERR_GET_REASON(err) == X509_R_CERT_ALREADY_IN_HASH_TABLE) {
            wpa_printf(MSG_DEBUG, "OpenSSL: %s - ignoring cert"
                    " already in hash table error",
                    __func__);
        } else {
            X509_free(cert);
            return -1;
        }
    }
    X509_free(cert);
    wpa_printf(MSG_DEBUG, "OpenSSL: %s - added CA certificate from engine "
            "to certificate store", __func__);
    SSL_set_verify(conn->ssl, SSL_VERIFY_PEER, tls_verify_cb);
    return 0;

#else /* OPENSSL_NO_ENGINE */
    return -1;
#endif /* OPENSSL_NO_ENGINE */
}


static int tls_connection_engine_private_key(struct tls_connection *conn)
{
#ifndef OPENSSL_NO_ENGINE
    if (SSL_use_PrivateKey(conn->ssl, conn->private_key) != 1) {
        tls_show_errors(MSG_ERROR, __func__,
                "ENGINE: cannot use private key for TLS");
        return -1;
    }
    if (!SSL_check_private_key(conn->ssl)) {
        tls_show_errors(MSG_INFO, __func__,
                "Private key failed verification");
        return -1;
    }
    return 0;
#else /* OPENSSL_NO_ENGINE */
    wpa_printf(MSG_ERROR, "SSL: Configuration uses engine, but "
            "engine support was not compiled in");
    return -1;
#endif /* OPENSSL_NO_ENGINE */
}


static int tls_connection_private_key(void *_ssl_ctx,
        struct tls_connection *conn,
        const char *private_key,
        const char *private_key_passwd,
        const u8 *private_key_blob,
        size_t private_key_blob_len)
{
    SSL_CTX *ssl_ctx = _ssl_ctx;
    char *passwd;
    int ok;

    if (private_key == NULL && private_key_blob == NULL)
        return 0;

    if (private_key_passwd) {
        passwd = os_strdup(private_key_passwd);
        if (passwd == NULL)
            return -1;
    } else
        passwd = NULL;

    SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
    SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);

    ok = 0;
    while (private_key_blob) {
        if (SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA, conn->ssl,
                    (u8 *) private_key_blob,
                    private_key_blob_len) == 1) {
            wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
                    "ASN1(EVP_PKEY_RSA) --> OK");
            ok = 1;
            break;
        } else {
            tls_show_errors(MSG_DEBUG, __func__,
                    "SSL_use_PrivateKey_ASN1(EVP_PKEY_RSA)"
                    " failed");
        }

        if (SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA, conn->ssl,
                    (u8 *) private_key_blob,
                    private_key_blob_len) == 1) {
            wpa_printf(MSG_DEBUG, "OpenSSL: SSL_use_PrivateKey_"
                    "ASN1(EVP_PKEY_DSA) --> OK");
            ok = 1;
            break;
        } else {
            tls_show_errors(MSG_DEBUG, __func__,
                    "SSL_use_PrivateKey_ASN1(EVP_PKEY_DSA)"
                    " failed");
        }

        if (SSL_use_RSAPrivateKey_ASN1(conn->ssl,
                    (u8 *) private_key_blob,
                    private_key_blob_len) == 1) {
            wpa_printf(MSG_DEBUG, "OpenSSL: "
                    "SSL_use_RSAPrivateKey_ASN1 --> OK");
            ok = 1;
            break;
        } else {
            tls_show_errors(MSG_DEBUG, __func__,
                    "SSL_use_RSAPrivateKey_ASN1 failed");
        }

        if (tls_read_pkcs12_blob(ssl_ctx, conn->ssl, private_key_blob,
                    private_key_blob_len, passwd) == 0) {
            wpa_printf(MSG_DEBUG, "OpenSSL: PKCS#12 as blob --> "
                    "OK");
            ok = 1;
            break;
        }

        break;
    }

    while (!ok && private_key) {
#ifndef OPENSSL_NO_STDIO
        if (SSL_use_PrivateKey_file(conn->ssl, private_key,
                    SSL_FILETYPE_ASN1) == 1) {
            wpa_printf(MSG_DEBUG, "OpenSSL: "
                    "SSL_use_PrivateKey_File (DER) --> OK");
            ok = 1;
            break;
        } else {
            tls_show_errors(MSG_DEBUG, __func__,
                    "SSL_use_PrivateKey_File (DER) "
                    "failed");
        }

        if (SSL_use_PrivateKey_file(conn->ssl, private_key,
                    SSL_FILETYPE_PEM) == 1) {
            wpa_printf(MSG_DEBUG, "OpenSSL: "
                    "SSL_use_PrivateKey_File (PEM) --> OK");
            ok = 1;
            break;
        } else {
            tls_show_errors(MSG_DEBUG, __func__,
                    "SSL_use_PrivateKey_File (PEM) "
                    "failed");
        }
#else /* OPENSSL_NO_STDIO */
        wpa_printf(MSG_DEBUG, "OpenSSL: %s - OPENSSL_NO_STDIO",
                __func__);
#endif /* OPENSSL_NO_STDIO */

        if (tls_read_pkcs12(ssl_ctx, conn->ssl, private_key, passwd)
                == 0) {
            wpa_printf(MSG_DEBUG, "OpenSSL: Reading PKCS#12 file "
                    "--> OK");
            ok = 1;
            break;
        }

        if (tls_cryptoapi_cert(conn->ssl, private_key) == 0) {
            wpa_printf(MSG_DEBUG, "OpenSSL: Using CryptoAPI to "
                    "access certificate store --> OK");
            ok = 1;
            break;
        }

        break;
    }

    if (!ok) {
        wpa_printf(MSG_INFO, "OpenSSL: Failed to load private key");
        os_free(passwd);
        ERR_clear_error();
        return -1;
    }
    ERR_clear_error();
    SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);
    os_free(passwd);

    if (!SSL_check_private_key(conn->ssl)) {
        tls_show_errors(MSG_INFO, __func__, "Private key failed "
                "verification");
        return -1;
    }

    wpa_printf(MSG_DEBUG, "SSL: Private key loaded successfully");
    return 0;
}


static int tls_global_private_key(SSL_CTX *ssl_ctx, const char *private_key,
        const char *private_key_passwd)
{
    char *passwd;

    if (private_key == NULL)
        return 0;

    if (private_key_passwd) {
        passwd = os_strdup(private_key_passwd);
        if (passwd == NULL)
            return -1;
    } else
        passwd = NULL;

    SSL_CTX_set_default_passwd_cb(ssl_ctx, tls_passwd_cb);
    SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, passwd);
    if (
#ifndef OPENSSL_NO_STDIO
            SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
                SSL_FILETYPE_ASN1) != 1 &&
            SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key,
                SSL_FILETYPE_PEM) != 1 &&
#endif /* OPENSSL_NO_STDIO */
            tls_read_pkcs12(ssl_ctx, NULL, private_key, passwd)) {
        tls_show_errors(MSG_INFO, __func__,
                "Failed to load private key");
        os_free(passwd);
        ERR_clear_error();
        return -1;
    }
    os_free(passwd);
    ERR_clear_error();
    SSL_CTX_set_default_passwd_cb(ssl_ctx, NULL);

    if (!SSL_CTX_check_private_key(ssl_ctx)) {
        tls_show_errors(MSG_INFO, __func__,
                "Private key failed verification");
        return -1;
    }

    return 0;
}


static int tls_connection_dh(struct tls_connection *conn, const char *dh_file)
{
#ifdef OPENSSL_NO_DH
    if (dh_file == NULL)
        return 0;
    wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
            "dh_file specified");
    return -1;
#else /* OPENSSL_NO_DH */
    DH *dh;
    BIO *bio;

    /* TODO: add support for dh_blob */
    if (dh_file == NULL)
        return 0;
    if (conn == NULL)
        return -1;

    bio = BIO_new_file(dh_file, "r");
    if (bio == NULL) {
        wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
                dh_file, ERR_error_string(ERR_get_error(), NULL));
        return -1;
    }
    dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
    BIO_free(bio);
#ifndef OPENSSL_NO_DSA
    while (dh == NULL) {
        DSA *dsa;
        wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
                " trying to parse as DSA params", dh_file,
                ERR_error_string(ERR_get_error(), NULL));
        bio = BIO_new_file(dh_file, "r");
        if (bio == NULL)
            break;
        dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
        BIO_free(bio);
        if (!dsa) {
            wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
                    "'%s': %s", dh_file,
                    ERR_error_string(ERR_get_error(), NULL));
            break;
        }

        wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
        dh = DSA_dup_DH(dsa);
        DSA_free(dsa);
        if (dh == NULL) {
            wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
                    "params into DH params");
            break;
        }
        break;
    }
#endif /* !OPENSSL_NO_DSA */
    if (dh == NULL) {
        wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
                "'%s'", dh_file);
        return -1;
    }

    if (SSL_set_tmp_dh(conn->ssl, dh) != 1) {
        wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
                "%s", dh_file,
                ERR_error_string(ERR_get_error(), NULL));
        DH_free(dh);
        return -1;
    }
    DH_free(dh);
    return 0;
#endif /* OPENSSL_NO_DH */
}


static int tls_global_dh(SSL_CTX *ssl_ctx, const char *dh_file)
{
#ifdef OPENSSL_NO_DH
    if (dh_file == NULL)
        return 0;
    wpa_printf(MSG_ERROR, "TLS: openssl does not include DH support, but "
            "dh_file specified");
    return -1;
#else /* OPENSSL_NO_DH */
    DH *dh;
    BIO *bio;

    /* TODO: add support for dh_blob */
    if (dh_file == NULL)
        return 0;
    if (ssl_ctx == NULL)
        return -1;

    bio = BIO_new_file(dh_file, "r");
    if (bio == NULL) {
        wpa_printf(MSG_INFO, "TLS: Failed to open DH file '%s': %s",
                dh_file, ERR_error_string(ERR_get_error(), NULL));
        return -1;
    }
    dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
    BIO_free(bio);
#ifndef OPENSSL_NO_DSA
    while (dh == NULL) {
        DSA *dsa;
        wpa_printf(MSG_DEBUG, "TLS: Failed to parse DH file '%s': %s -"
                " trying to parse as DSA params", dh_file,
                ERR_error_string(ERR_get_error(), NULL));
        bio = BIO_new_file(dh_file, "r");
        if (bio == NULL)
            break;
        dsa = PEM_read_bio_DSAparams(bio, NULL, NULL, NULL);
        BIO_free(bio);
        if (!dsa) {
            wpa_printf(MSG_DEBUG, "TLS: Failed to parse DSA file "
                    "'%s': %s", dh_file,
                    ERR_error_string(ERR_get_error(), NULL));
            break;
        }

        wpa_printf(MSG_DEBUG, "TLS: DH file in DSA param format");
        dh = DSA_dup_DH(dsa);
        DSA_free(dsa);
        if (dh == NULL) {
            wpa_printf(MSG_INFO, "TLS: Failed to convert DSA "
                    "params into DH params");
            break;
        }
        break;
    }
#endif /* !OPENSSL_NO_DSA */
    if (dh == NULL) {
        wpa_printf(MSG_INFO, "TLS: Failed to read/parse DH/DSA file "
                "'%s'", dh_file);
        return -1;
    }

    if (SSL_CTX_set_tmp_dh(ssl_ctx, dh) != 1) {
        wpa_printf(MSG_INFO, "TLS: Failed to set DH params from '%s': "
                "%s", dh_file,
                ERR_error_string(ERR_get_error(), NULL));
        DH_free(dh);
        return -1;
    }
    DH_free(dh);
    return 0;
#endif /* OPENSSL_NO_DH */
}


int tls_connection_get_keys(void *ssl_ctx, struct tls_connection *conn,
        struct tls_keys *keys)
{
    SSL *ssl;

    if (conn == NULL || keys == NULL)
        return -1;
    ssl = conn->ssl;
    if (ssl == NULL || ssl->s3 == NULL || ssl->session == NULL)
        return -1;

    os_memset(keys, 0, sizeof(*keys));
    keys->master_key = ssl->session->master_key;
    keys->master_key_len = ssl->session->master_key_length;
    keys->client_random = ssl->s3->client_random;
    keys->client_random_len = SSL3_RANDOM_SIZE;
    keys->server_random = ssl->s3->server_random;
    keys->server_random_len = SSL3_RANDOM_SIZE;

    return 0;
}


int tls_connection_prf(void *tls_ctx, struct tls_connection *conn,
        const char *label, int server_random_first,
        u8 *out, size_t out_len)
{
    return -1;
}


    static struct wpabuf *
openssl_handshake(struct tls_connection *conn, const struct wpabuf *in_data,
        int server)
{
    int res;
    struct wpabuf *out_data;

    /*
     * Give TLS handshake data from the server (if available) to OpenSSL
     * for processing.
     */
    if (in_data &&
            BIO_write(conn->ssl_in, wpabuf_head(in_data), wpabuf_len(in_data))
            < 0) {
        tls_show_errors(MSG_INFO, __func__,
                "Handshake failed - BIO_write");
        return NULL;
    }

    /* Initiate TLS handshake or continue the existing handshake */
    if (server)
        res = SSL_accept(conn->ssl);
    else
        res = SSL_connect(conn->ssl);
    if (res != 1) {
        int err = SSL_get_error(conn->ssl, res);
        if (err == SSL_ERROR_WANT_READ)
            wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want "
                    "more data");
        else if (err == SSL_ERROR_WANT_WRITE)
            wpa_printf(MSG_DEBUG, "SSL: SSL_connect - want to "
                    "write");
        else {
            tls_show_errors(MSG_INFO, __func__, "SSL_connect");
            conn->failed++;
        }
    }

    /* Get the TLS handshake data to be sent to the server */
    res = BIO_ctrl_pending(conn->ssl_out);
    wpa_printf(MSG_DEBUG, "SSL: %d bytes pending from ssl_out", res);
    out_data = wpabuf_alloc(res);
    if (out_data == NULL) {
        wpa_printf(MSG_DEBUG, "SSL: Failed to allocate memory for "
                "handshake output (%d bytes)", res);
        if (BIO_reset(conn->ssl_out) < 0) {
            tls_show_errors(MSG_INFO, __func__,
                    "BIO_reset failed");
        }
        return NULL;
    }
    res = res == 0 ? 0 : BIO_read(conn->ssl_out, wpabuf_mhead(out_data),
            res);
    if (res < 0) {
        tls_show_errors(MSG_INFO, __func__,
                "Handshake failed - BIO_read");
        if (BIO_reset(conn->ssl_out) < 0) {
            tls_show_errors(MSG_INFO, __func__,
                    "BIO_reset failed");
        }
        wpabuf_free(out_data);
        return NULL;
    }
    wpabuf_put(out_data, res);

    return out_data;
}


    static struct wpabuf *
openssl_get_appl_data(struct tls_connection *conn, size_t max_len)
{
    struct wpabuf *appl_data;
    int res;

    appl_data = wpabuf_alloc(max_len + 100);
    if (appl_data == NULL)
        return NULL;

    res = SSL_read(conn->ssl, wpabuf_mhead(appl_data),
            wpabuf_size(appl_data));
    if (res < 0) {
        int err = SSL_get_error(conn->ssl, res);
        if (err == SSL_ERROR_WANT_READ ||
                err == SSL_ERROR_WANT_WRITE) {
            wpa_printf(MSG_DEBUG, "SSL: No Application Data "
                    "included");
        } else {
            tls_show_errors(MSG_INFO, __func__,
                    "Failed to read possible "
                    "Application Data");
        }
        wpabuf_free(appl_data);
        return NULL;
    }

    wpabuf_put(appl_data, res);
    wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application Data in Finished "
            "message", appl_data);

    return appl_data;
}


    static struct wpabuf *
openssl_connection_handshake(struct tls_connection *conn,
        const struct wpabuf *in_data,
        struct wpabuf **appl_data, int server)
{
    struct wpabuf *out_data;

    if (appl_data)
        *appl_data = NULL;

    out_data = openssl_handshake(conn, in_data, server);
    if (out_data == NULL)
        return NULL;

    if (SSL_is_init_finished(conn->ssl) && appl_data && in_data)
        *appl_data = openssl_get_appl_data(conn, wpabuf_len(in_data));

    return out_data;
}


    struct wpabuf *
tls_connection_handshake(void *ssl_ctx, struct tls_connection *conn,
        const struct wpabuf *in_data,
        struct wpabuf **appl_data)
{
    return openssl_connection_handshake(conn, in_data, appl_data, 0);
}


struct wpabuf * tls_connection_server_handshake(void *tls_ctx,
        struct tls_connection *conn,
        const struct wpabuf *in_data,
        struct wpabuf **appl_data)
{
    return openssl_connection_handshake(conn, in_data, appl_data, 1);
}


struct wpabuf * tls_connection_encrypt(void *tls_ctx,
        struct tls_connection *conn,
        const struct wpabuf *in_data)
{
    int res;
    struct wpabuf *buf;

    if (conn == NULL)
        return NULL;

    /* Give plaintext data for OpenSSL to encrypt into the TLS tunnel. */
    if ((res = BIO_reset(conn->ssl_in)) < 0 ||
            (res = BIO_reset(conn->ssl_out)) < 0) {
        tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
        return NULL;
    }
    res = SSL_write(conn->ssl, wpabuf_head(in_data), wpabuf_len(in_data));
    if (res < 0) {
        tls_show_errors(MSG_INFO, __func__,
                "Encryption failed - SSL_write");
        return NULL;
    }

    /* Read encrypted data to be sent to the server */
    buf = wpabuf_alloc(wpabuf_len(in_data) + 300);
    if (buf == NULL)
        return NULL;
    res = BIO_read(conn->ssl_out, wpabuf_mhead(buf), wpabuf_size(buf));
    if (res < 0) {
        tls_show_errors(MSG_INFO, __func__,
                "Encryption failed - BIO_read");
        wpabuf_free(buf);
        return NULL;
    }
    wpabuf_put(buf, res);

    return buf;
}


struct wpabuf * tls_connection_decrypt(void *tls_ctx,
        struct tls_connection *conn,
        const struct wpabuf *in_data)
{
    int res;
    struct wpabuf *buf;

    /* Give encrypted data from TLS tunnel for OpenSSL to decrypt. */
    res = BIO_write(conn->ssl_in, wpabuf_head(in_data),
            wpabuf_len(in_data));
    if (res < 0) {
        tls_show_errors(MSG_INFO, __func__,
                "Decryption failed - BIO_write");
        return NULL;
    }
    if (BIO_reset(conn->ssl_out) < 0) {
        tls_show_errors(MSG_INFO, __func__, "BIO_reset failed");
        return NULL;
    }

    /* Read decrypted data for further processing */
    /*
     * Even though we try to disable TLS compression, it is possible that
     * this cannot be done with all TLS libraries. Add extra buffer space
     * to handle the possibility of the decrypted data being longer than
     * input data.
     */
    buf = wpabuf_alloc((wpabuf_len(in_data) + 500) * 3);
    if (buf == NULL)
        return NULL;
    res = SSL_read(conn->ssl, wpabuf_mhead(buf), wpabuf_size(buf));
    if (res < 0) {
        tls_show_errors(MSG_INFO, __func__,
                "Decryption failed - SSL_read");
        wpabuf_free(buf);
        return NULL;
    }
    wpabuf_put(buf, res);

    return buf;
}


int tls_connection_resumed(void *ssl_ctx, struct tls_connection *conn)
{
    return conn ? conn->ssl->hit : 0;
}


int tls_connection_set_cipher_list(void *tls_ctx, struct tls_connection *conn,
        u8 *ciphers)
{
    char buf[100], *pos, *end;
    u8 *c;
    int ret;

    if (conn == NULL || conn->ssl == NULL || ciphers == NULL)
        return -1;

    buf[0] = '\0';
    pos = buf;
    end = pos + sizeof(buf);

    c = ciphers;
    while (*c != TLS_CIPHER_NONE) {
        const char *suite;

        switch (*c) {
            case TLS_CIPHER_RC4_SHA:
                suite = "RC4-SHA";
                break;
            case TLS_CIPHER_AES128_SHA:
                suite = "AES128-SHA";
                break;
            case TLS_CIPHER_RSA_DHE_AES128_SHA:
                suite = "DHE-RSA-AES128-SHA";
                break;
            case TLS_CIPHER_ANON_DH_AES128_SHA:
                suite = "ADH-AES128-SHA";
                break;
            default:
                wpa_printf(MSG_DEBUG, "TLS: Unsupported "
                        "cipher selection: %d", *c);
                return -1;
        }
        ret = os_snprintf(pos, end - pos, ":%s", suite);
        if (ret < 0 || ret >= end - pos)
            break;
        pos += ret;

        c++;
    }

    wpa_printf(MSG_DEBUG, "OpenSSL: cipher suites: %s", buf + 1);

    if (SSL_set_cipher_list(conn->ssl, buf + 1) != 1) {
        tls_show_errors(MSG_INFO, __func__,
                "Cipher suite configuration failed");
        return -1;
    }

    return 0;
}


int tls_get_cipher(void *ssl_ctx, struct tls_connection *conn,
        char *buf, size_t buflen)
{
    const char *name;
    if (conn == NULL || conn->ssl == NULL)
        return -1;

    name = SSL_get_cipher(conn->ssl);
    if (name == NULL)
        return -1;

    os_strlcpy(buf, name, buflen);
    return 0;
}


int tls_connection_enable_workaround(void *ssl_ctx,
        struct tls_connection *conn)
{
    SSL_set_options(conn->ssl, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS);

    return 0;
}


#if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
/* ClientHello TLS extensions require a patch to openssl, so this function is
 * commented out unless explicitly needed for EAP-FAST in order to be able to
 * build this file with unmodified openssl. */
int tls_connection_client_hello_ext(void *ssl_ctx, struct tls_connection *conn,
        int ext_type, const u8 *data,
        size_t data_len)
{
    if (conn == NULL || conn->ssl == NULL || ext_type != 35)
        return -1;

#ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
    if (SSL_set_session_ticket_ext(conn->ssl, (void *) data,
                data_len) != 1)
        return -1;
#else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
    if (SSL_set_hello_extension(conn->ssl, ext_type, (void *) data,
                data_len) != 1)
        return -1;
#endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */

    return 0;
}
#endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */


int tls_connection_get_failed(void *ssl_ctx, struct tls_connection *conn)
{
    if (conn == NULL)
        return -1;
    return conn->failed;
}


int tls_connection_get_read_alerts(void *ssl_ctx, struct tls_connection *conn)
{
    if (conn == NULL)
        return -1;
    return conn->read_alerts;
}


int tls_connection_get_write_alerts(void *ssl_ctx, struct tls_connection *conn)
{
    if (conn == NULL)
        return -1;
    return conn->write_alerts;
}


int tls_connection_set_params(void *tls_ctx, struct tls_connection *conn,
        const struct tls_connection_params *params)
{
    int ret;
    unsigned long err;

    if (conn == NULL)
        return -1;

    while ((err = ERR_get_error())) {
        wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
                __func__, ERR_error_string(err, NULL));
    }

    if (params->engine) {
        wpa_printf(MSG_DEBUG, "SSL: Initializing TLS engine");
        ret = tls_engine_init(conn, params->engine_id, params->pin,
                params->key_id, params->cert_id,
                params->ca_cert_id);
        if (ret)
            return ret;
    }
    if (tls_connection_set_subject_match(conn,
                params->subject_match,
                params->altsubject_match))
        return -1;

    if (params->engine && params->ca_cert_id) {
        if (tls_connection_engine_ca_cert(tls_ctx, conn,
                    params->ca_cert_id))
            return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
    } else if (tls_connection_ca_cert(tls_ctx, conn, params->ca_cert,
                params->ca_cert_blob,
                params->ca_cert_blob_len,
                params->ca_path))
        return -1;

    if (params->engine && params->cert_id) {
        if (tls_connection_engine_client_cert(conn, params->cert_id))
            return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
    } else if (tls_connection_client_cert(conn, params->client_cert,
                params->client_cert_blob,
                params->client_cert_blob_len))
        return -1;

    if (params->engine && params->key_id) {
        wpa_printf(MSG_DEBUG, "TLS: Using private key from engine");
        if (tls_connection_engine_private_key(conn))
            return TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED;
    } else if (tls_connection_private_key(tls_ctx, conn,
                params->private_key,
                params->private_key_passwd,
                params->private_key_blob,
                params->private_key_blob_len)) {
        wpa_printf(MSG_INFO, "TLS: Failed to load private key '%s'",
                params->private_key);
        return -1;
    }

    if (tls_connection_dh(conn, params->dh_file)) {
        wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
                params->dh_file);
        return -1;
    }

    tls_get_errors(tls_ctx);

    return 0;
}


int tls_global_set_params(void *tls_ctx,
        const struct tls_connection_params *params)
{
    SSL_CTX *ssl_ctx = tls_ctx;
    unsigned long err;

    while ((err = ERR_get_error())) {
        wpa_printf(MSG_INFO, "%s: Clearing pending SSL error: %s",
                __func__, ERR_error_string(err, NULL));
    }

    if (tls_global_ca_cert(ssl_ctx, params->ca_cert))
        return -1;

    if (tls_global_client_cert(ssl_ctx, params->client_cert))
        return -1;

    if (tls_global_private_key(ssl_ctx, params->private_key,
                params->private_key_passwd))
        return -1;

    if (tls_global_dh(ssl_ctx, params->dh_file)) {
        wpa_printf(MSG_INFO, "TLS: Failed to load DH file '%s'",
                params->dh_file);
        return -1;
    }

    return 0;
}


int tls_connection_get_keyblock_size(void *tls_ctx,
        struct tls_connection *conn)
{
    const EVP_CIPHER *c;
    const EVP_MD *h;

    if (conn == NULL || conn->ssl == NULL ||
            conn->ssl->enc_read_ctx == NULL ||
            conn->ssl->enc_read_ctx->cipher == NULL ||
            conn->ssl->read_hash == NULL)
        return -1;

    c = conn->ssl->enc_read_ctx->cipher;
#if OPENSSL_VERSION_NUMBER >= 0x00909000L
    h = EVP_MD_CTX_md(conn->ssl->read_hash);
#else
    h = conn->ssl->read_hash;
#endif

    return 2 * (EVP_CIPHER_key_length(c) +
            EVP_MD_size(h) +
            EVP_CIPHER_iv_length(c));
}


unsigned int tls_capabilities(void *tls_ctx)
{
    return 0;
}


int tls_connection_set_ia(void *tls_ctx, struct tls_connection *conn,
        int tls_ia)
{
    return -1;
}


struct wpabuf * tls_connection_ia_send_phase_finished(
        void *tls_ctx, struct tls_connection *conn, int final)
{
    return NULL;
}


int tls_connection_ia_final_phase_finished(void *tls_ctx,
        struct tls_connection *conn)
{
    return -1;
}


int tls_connection_ia_permute_inner_secret(void *tls_ctx,
        struct tls_connection *conn,
        const u8 *key, size_t key_len)
{
    return -1;
}


#if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
/* Pre-shared secred requires a patch to openssl, so this function is
 * commented out unless explicitly needed for EAP-FAST in order to be able to
 * build this file with unmodified openssl. */

static int tls_sess_sec_cb(SSL *s, void *secret, int *secret_len,
        STACK_OF(SSL_CIPHER) *peer_ciphers,
        SSL_CIPHER **cipher, void *arg)
{
    struct tls_connection *conn = arg;
    int ret;

    if (conn == NULL || conn->session_ticket_cb == NULL)
        return 0;

    ret = conn->session_ticket_cb(conn->session_ticket_cb_ctx,
            conn->session_ticket,
            conn->session_ticket_len,
            s->s3->client_random,
            s->s3->server_random, secret);
    os_free(conn->session_ticket);
    conn->session_ticket = NULL;

    if (ret <= 0)
        return 0;

    *secret_len = SSL_MAX_MASTER_KEY_LENGTH;
    return 1;
}


#ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
static int tls_session_ticket_ext_cb(SSL *s, const unsigned char *data,
        int len, void *arg)
{
    struct tls_connection *conn = arg;

    if (conn == NULL || conn->session_ticket_cb == NULL)
        return 0;

    wpa_printf(MSG_DEBUG, "OpenSSL: %s: length=%d", __func__, len);

    os_free(conn->session_ticket);
    conn->session_ticket = NULL;

    wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
            "extension", data, len);

    conn->session_ticket = os_malloc(len);
    if (conn->session_ticket == NULL)
        return 0;

    os_memcpy(conn->session_ticket, data, len);
    conn->session_ticket_len = len;

    return 1;
}
#else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
#ifdef SSL_OP_NO_TICKET
static void tls_hello_ext_cb(SSL *s, int client_server, int type,
        unsigned char *data, int len, void *arg)
{
    struct tls_connection *conn = arg;

    if (conn == NULL || conn->session_ticket_cb == NULL)
        return;

    wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
            type, len);

    if (type == TLSEXT_TYPE_session_ticket && !client_server) {
        os_free(conn->session_ticket);
        conn->session_ticket = NULL;

        wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
                "extension", data, len);
        conn->session_ticket = os_malloc(len);
        if (conn->session_ticket == NULL)
            return;

        os_memcpy(conn->session_ticket, data, len);
        conn->session_ticket_len = len;
    }
}
#else /* SSL_OP_NO_TICKET */
static int tls_hello_ext_cb(SSL *s, TLS_EXTENSION *ext, void *arg)
{
    struct tls_connection *conn = arg;

    if (conn == NULL || conn->session_ticket_cb == NULL)
        return 0;

    wpa_printf(MSG_DEBUG, "OpenSSL: %s: type=%d length=%d", __func__,
            ext->type, ext->length);

    os_free(conn->session_ticket);
    conn->session_ticket = NULL;

    if (ext->type == 35) {
        wpa_hexdump(MSG_DEBUG, "OpenSSL: ClientHello SessionTicket "
                "extension", ext->data, ext->length);
        conn->session_ticket = os_malloc(ext->length);
        if (conn->session_ticket == NULL)
            return SSL_AD_INTERNAL_ERROR;

        os_memcpy(conn->session_ticket, ext->data, ext->length);
        conn->session_ticket_len = ext->length;
    }

    return 0;
}
#endif /* SSL_OP_NO_TICKET */
#endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
#endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */


int tls_connection_set_session_ticket_cb(void *tls_ctx,
        struct tls_connection *conn,
        tls_session_ticket_cb cb,
        void *ctx)
{
#if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST)
    conn->session_ticket_cb = cb;
    conn->session_ticket_cb_ctx = ctx;

    if (cb) {
        if (SSL_set_session_secret_cb(conn->ssl, tls_sess_sec_cb,
                    conn) != 1)
            return -1;
#ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
        SSL_set_session_ticket_ext_cb(conn->ssl,
                tls_session_ticket_ext_cb, conn);
#else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
#ifdef SSL_OP_NO_TICKET
        SSL_set_tlsext_debug_callback(conn->ssl, tls_hello_ext_cb);
        SSL_set_tlsext_debug_arg(conn->ssl, conn);
#else /* SSL_OP_NO_TICKET */
        if (SSL_set_hello_extension_cb(conn->ssl, tls_hello_ext_cb,
                    conn) != 1)
            return -1;
#endif /* SSL_OP_NO_TICKET */
#endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
    } else {
        if (SSL_set_session_secret_cb(conn->ssl, NULL, NULL) != 1)
            return -1;
#ifdef CONFIG_OPENSSL_TICKET_OVERRIDE
        SSL_set_session_ticket_ext_cb(conn->ssl, NULL, NULL);
#else /* CONFIG_OPENSSL_TICKET_OVERRIDE */
#ifdef SSL_OP_NO_TICKET
        SSL_set_tlsext_debug_callback(conn->ssl, NULL);
        SSL_set_tlsext_debug_arg(conn->ssl, conn);
#else /* SSL_OP_NO_TICKET */
        if (SSL_set_hello_extension_cb(conn->ssl, NULL, NULL) != 1)
            return -1;
#endif /* SSL_OP_NO_TICKET */
#endif /* CONFIG_OPENSSL_TICKET_OVERRIDE */
    }

    return 0;
#else /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
    return -1;
#endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
}
